The shaded regions X and Y indicate changes in the energy level of the system. Which of the following correctly identifies these shaded areas? * 2 points Captionless Image Region X = energy released by the system at the start, Region Y = energy released by the system at the end Region X = energy difference between reactants and products, Region Y = sum of energy of reactants and products Region X = energy required to initiate the reaction, Region Y = energy released by the reaction Region X = energy gained by the surroundings of the system, Region Y = energy lost by the surroundings of the system

the answer is definitely c.

catya that's not even a b or c

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.